Plex (Allows me to stream downloaded media content. (with a 3TB Media Server))
Twitch (I mostly use it for e-sport event, mostly Blizzard event)
WowTV (instead of paying 40$/month for TV, I get channel from around the world for 180/year)

I'm just posting this here so we can share Roku channel with each other
If you use Roku too, please share with us a list of channel you frequently use.